Manufacture of a new pyrazolone-azo dye.



UNITED STATES PATENT OFFICE.

KARL ELBEL, F BIEBEICH, GERMANY, ASSIGNOB TO THE FIRM OF KALLE & C0

AKTIENGESELLSQHAFT, OF BIEBRICH, GERMANY.

MANUFACTURE OF A NEW PYRAZO LONE-AZO DYE.

N 0 Drawing.

Specification of Letters Patent.

Application fllcd September 18, 1911. Serial No. 649,959.

Patented May 14, 1912.

To all whom it may concern Be it known that I, KARL ELBEL, a citizen of-the German Empire, residing at Bie-- 'auge tints which after treatment with lll' brich-on-the-Rhine, Germany, ha ye invented certain new and useful Improvements inthe 1 Manufacture of a New Iyrazolone-Azo Dye.

of which the following is a specification.

In my specification of the same date I have described a process for producing fast azo dyestutl's by coupling the chloro-l-diazo' Q-OXy-naphthalene-l-sulfonic acid with azo dyestulf components including pyrazolone. I have further found that a very valuable dyestutl" of this kind can be obtained by coupling the aforesaid chloro-1-diazo-2-oxynaphthalene-4-sulfonic acid with l-phenyl- 3-methyl-5pyrazolone.

The present invention relates to a dyestutf obtainable from the aforesaid chloro-ldiazo-2-oxy-naphthaleue-4-sulfonic acid with a' pyrazolone such as the l-phenyl-3-methyl- 5pyrazolone above mentioned.

I proceed as follows: The chlorinated diazo compound obtained according to the process of Example 1 of my above mentioned application i. e. by chlorination 0f'125 kilograms of -1-diazo-2-oxy-naphthalene-4-sulfonic acid in presence of fuming sulfuric acid, is stirred with 300 liters of water and neutralized by the addition of calcined sodium carbonate. Tov this neutral solution there isadded a warm solution of 95 ki1o-' grams of 1-phenyl-3-methyl-5-pyrazolone and 75 'kg. carbonate of sodium in 400 liters of water and 65 kg. of caustic soda lye of 40 B. The temperature may rise during this procedure up to about 40 degrees centigrade. Afterward the. mass is stirred some hoursand left until next morning. Then it is diluted with 1250 liters of Water and 1 acidified 'with hydrochloric acid, whereupon the 'dyestufl' is separated completely by means of 250 kg. of common salt. It is 7 filtered, pressed and dried. .The dyestufl' thus obtained is soluble in water with a yel-- bluish-red on the addition of alkali. It produces on wool in an acid bath reddish-orter obtainable by combining the chloro-ldiaz(.)-2-oxy-naphthalene-l-sulfonic acid with a pyrazolone,which dyestutl' is decomposed when treated with reducing agents into a chloro 1 amino 2 oxy-naphthalene 4 sulfonic acid, and an amino derivative of the pyrazolone component used.

2. As a new product the axe coloring matter obtainable by combining the chloro-l- .diazo-2-oxy-naphthalene-l-sulfmic acidwith l-phenyl-S-Inethyl-5-pyrazoloue, which is in dry state a red powder, soluble in water with a yellowisha'ed color turning into a dull bluish-red. on the addition of alkali, and in concentrated sulfuric acid with a pure bluish-red color, producing on wool in an acid bath reddish-orange tints, which after treatment with bichromate turn into a bright bluish-red. and being decomposed by means of reducing agents into chloro-l amino-2-oxy-naphthalenel-sulfonic acid on the one hand; and 4 amino-1-phenyl-3- methyl-5-pyrazolone on the other hand.

Intestimonywvhereof I haye signed my name to this specification'in the presence of two subscribing witnesses.

KARL ELBEL.

Witnesses Aueosr Roan,-

'JOHANN Ramnxsnc.

llowish-red color which turns into a dull 

